CN213275352U - Raman signal collecting probe based on off-axis parabolic reflector - Google Patents
Raman signal collecting probe based on off-axis parabolic reflector Download PDFInfo
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- CN213275352U CN213275352U CN202021546720.5U CN202021546720U CN213275352U CN 213275352 U CN213275352 U CN 213275352U CN 202021546720 U CN202021546720 U CN 202021546720U CN 213275352 U CN213275352 U CN 213275352U
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Abstract
The utility model discloses a Raman signal collection probe based on off-axis parabolic mirror, include: the device comprises a hollow probe cavity, an excitation light focusing unit and a first off-axis parabolic reflector, wherein the excitation light focusing unit and the first off-axis parabolic reflector are arranged in the probe cavity; the exciting light focusing unit is used for focusing exciting light received by the light inlet of the probe cavity on the test sample; the test sample emits scattered light under excitation of the excitation light; the first off-axis parabolic reflector is used for collecting scattered light by utilizing the concave reflecting surface of the first off-axis parabolic reflector, and the collected scattered light is transmitted in the direction of the main axis of the first off-axis parabolic reflector. The probe overcomes the problem that the traditional optical fiber Raman can not be used for the deep ultraviolet band. Meanwhile, the design of a space free light path is adopted, the loss of light energy is reduced, the integrated design of the probe and various spectrometers is realized, and the probe is particularly suitable for application of a miniaturized, modularized and portable deep ultraviolet band Raman spectrometer.
Description
Technical Field
The application relates to a Raman signal collecting probe based on an off-axis parabolic reflector, and belongs to the technical field of signal collecting probes.
Background
Raman spectroscopy is an important modern spectroscopic technique, is widely applied to the fields of chemistry, physics, biology and other subjects, and is a powerful tool for researching molecular structures of substances.
The ultraviolet/deep ultraviolet Raman spectrum is particularly suitable for in-situ detection of the deep ultraviolet Raman spectrum in complex environments including ocean, vehicle-mounted, factory and other harsh conditions due to high sensitivity and capability of avoiding fluorescent signal interference.
However, the collection path of conventional fiber-optic probes typically relies on optical coupling, causing direct losses to the otherwise weak deep ultraviolet light source. Moreover, when the deep ultraviolet laser directly hits the medium such as optical fiber, lens, etc., serious background material Raman signals are generated, and the signal interference on the test sample cannot be avoided; meanwhile, the traditional probe collects scattered light emitted by a test sample by using a lens, and the collection efficiency is low due to the limited collection surface, so that the application range of the deep ultraviolet Raman is severely restricted.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a Raman signal collecting probe based on an off-axis parabolic reflector, and aims to solve the technical problems that scattering light collecting efficiency is low and a background material Raman signal influences a test sample signal in the existing Raman signal collecting probe.
The utility model discloses a Raman signal collection probe based on off-axis parabolic mirror, include: the device comprises a hollow probe cavity, an excitation light focusing unit and a first off-axis parabolic reflector, wherein the excitation light focusing unit and the first off-axis parabolic reflector are arranged in the probe cavity;
the excitation light focusing unit is used for focusing the excitation light received by the light inlet of the probe cavity on the test sample; the test sample emits scattered light under excitation of the excitation light;
the first off-axis parabolic reflector is used for collecting the scattered light by utilizing the concave reflecting surface of the first off-axis parabolic reflector, so that the collected scattered light is transmitted in the direction of the main axis of the first off-axis parabolic reflector.
Preferably, the excitation light focusing unit coincides with a focal point of the first off-axis parabolic mirror, and the test sample is disposed at the focal point;
correspondingly, the first off-axis parabolic reflector is used for collecting and collimating the scattered light by utilizing the concave reflecting surface of the first off-axis parabolic reflector, so that the collimated scattered light is transmitted in a direction parallel to the main axis of the first off-axis parabolic reflector.
Preferably, the excitation light received by the light inlet of the probe cavity is parallel light;
the excitation light focusing unit comprises a second off-axis parabolic mirror;
the second off-axis parabolic mirror coincides with the focus of the first off-axis parabolic mirror;
the direction of the main shaft of the second off-axis parabolic reflector is parallel to the light path of the exciting light;
the second off-axis parabolic reflector is used for focusing the exciting light on the test sample by utilizing the concave reflecting surface of the second off-axis parabolic reflector.
Preferably, the first off-axis parabolic mirror is disposed on a light path of the excitation light emitted by the second off-axis parabolic mirror;
the first off-axis parabolic reflector is provided with a light through hole, and the exciting light emitted by the second off-axis parabolic reflector irradiates the test sample through the light through hole.
Preferably, the ratio of the area of the light outlet of the light through hole to the projection area of the reflecting surface of the first off-axis parabolic reflector in the optical axis direction is less than 5%.
Preferably, the optical fiber probe further comprises an optical filter arranged in the probe cavity;
the optical filter is arranged on a light path of the scattered light emitted by the first off-axis parabolic reflector, and a plane where the optical filter surface is located is perpendicular to the transmission direction of the scattered light and is used for filtering Rayleigh signals in the scattered light.
Preferably, the device further comprises a rear focusing lens and an optical fiber coupler which are arranged in the probe cavity, and an optical fiber connected with the probe cavity;
the rear focusing lens is coaxially arranged with the optical filter and is used for focusing the scattered light emitted by the optical filter on the optical fiber coupler;
the optical fiber coupler is used for coupling the received scattered light into the optical fiber.
Preferably, the off-axis angles of the first off-axis parabolic reflector and the second off-axis parabolic reflector are both 75-115 degrees;
preferably, the off-axis angles of the first off-axis parabolic mirror and the second off-axis parabolic mirror are both 90 degrees.
Preferably, the wavelength of the exciting light is 177-700 nanometers;
preferably, the wavelength of the excitation light is 244-420 nm;
preferably, the wavelength of the excitation light is 244-270 nm.
Preferably, when the wavelength of the excitation light is 244 and 420 nanometers, the reflectivity of the first off-axis parabolic mirror and the reflectivity of the second off-axis parabolic mirror are both greater than or equal to 88%.
Preferably, the material of the probe cavity is non-transparent material.
The utility model discloses a Raman signal collection probe based on off-axis parabolic mirror compares in prior art, has following beneficial effect:
the utility model discloses a probe is collected to raman signal based on off-axis parabolic mirror, use first off-axis parabolic mirror to collect and the scattering light that the collimation was surveyed the sample and is produced under the excitation of exciting light, because it compares with the lens that occupies the same space, it is big to receive the face, so can gather more scattering lights, the light intensity of scattering light has been improved, thereby make the range of application of this probe wider, not only can be used to the collection of the raman light of visible light wave band, also can be used to the collection of the less strong raman light of deep ultraviolet wave band, the problem that traditional optic fibre raman can not be used for the deep ultraviolet wave band has been overcome. Meanwhile, the design of a space free light path is adopted, the loss of light energy is reduced, the integrated design of the probe and various spectrometers is realized, and the probe is particularly suitable for application of a miniaturized, modularized and portable deep ultraviolet band Raman spectrometer.
The excitation light focusing unit of this application uses off-axis parabolic mirror, and it utilizes the reflection to realize the focus of excitation light, compares in the mode that uses lens focusing among the prior art, and it can not produce because the laser directly hits the raman interference signal that arouses on focusing lens, can not produce the signal to the test sample and disturb, has guaranteed the precision that the probe gathered the signal.
This application sets up first off-axis parabolic mirror in the light path of the exciting light of second off-axis parabolic mirror outgoing to make the compact structure of whole probe, occupation space is little, and it is more convenient to use.
The size of the light through hole that sets up on the first off-axis parabolic mirror is injectd to this application to guaranteed that the exciting light can shine on test sample through the light through hole, can not be because of the collection of the too big scattered light that influences first off-axis parabolic mirror and produce test sample of light through the light through hole simultaneously again.
This application still sets up the light filter in probe cavity inside to with the Rayleigh signal filtering in the scattered light that test sample sent under the excitation of exciting light, keep raman signal, thereby guarantee the quality of the scattered light that the probe gathered.
In order to realize the connection of the probe and various spectrometers, a rear focusing lens is arranged in a cavity of the probe, so that scattered light passing through an optical filter is focused on an optical fiber coupler, and the optical fiber coupler is further coupled into an optical fiber. The connection of the probe and the spectrometer is realized by using the optical fiber.
The application defines the off-axis angle of the first off-axis parabolic reflector, thereby realizing the collection and collimation of scattered light positioned at the focus of the first off-axis parabolic reflector; the application defines the off-axis angle of the second off-axis parabolic reflector to ensure that the collimated excitation light can be focused on the test sample.
The material that this application injectd the probe cavity is non-transparent material to avoid external stray light's interference.
The wavelength range of the excitation light used by the probe is 177-700 nm, and the probe is particularly suitable for the excitation light of 244-270 nm.
When the wavelength of the excitation light is 244-420 nm, the reflectivity of the first off-axis parabolic reflector and the reflectivity of the second off-axis parabolic reflector are both required to be greater than or equal to 88%, so as to ensure the light intensity and quality of the collected scattered light.
Drawings
Fig. 1 is a side view of an embodiment of the invention of an off-axis parabolic mirror based raman signal collection probe;
fig. 2 is a bottom view of an embodiment of the raman signal collection probe based on an off-axis parabolic mirror;
FIG. 3 is a Raman spectrum of a sample of polytetrafluoroethylene obtained using the probe of the present application;
fig. 4 is a raman spectrum of a teflon sample obtained using a conventional raman probe.
List of parts and reference numerals:
1. exciting light; 2. a second off-axis parabolic mirror; 3. a first off-axis parabolic mirror; 4. a probe cavity; 5. testing the sample; 6. an optical filter; 7. a rear focusing lens; 8. a fiber coupler; 9. an optical fiber; 10. and a light through hole.
Detailed Description
The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples.
Fig. 1 is a side view of an off-axis parabolic mirror based raman signal collection probe of the present invention;
fig. 2 is a bottom view of the raman signal collecting probe based on the off-axis parabolic mirror of the present invention.
The embodiment of the utility model provides an in raman signal collection probe based on off-axis parabolic mirror, include: the probe comprises a hollow probe cavity 4, an excitation light focusing unit and a first off-axis parabolic reflector 3, wherein the excitation light focusing unit and the first off-axis parabolic reflector are arranged in the probe cavity 4; the excitation light focusing unit is used for focusing the excitation light received by the light inlet of the probe cavity 4 on the test sample 5; the test sample 5 emits scattered light under excitation of the excitation light; the first off-axis parabolic reflector 3 is used for collecting scattered light by utilizing the concave reflecting surface of the first off-axis parabolic reflector 3, and the collected scattered light is transmitted in the direction of the main axis of the first off-axis parabolic reflector 3.
In the embodiment of the application, the focus of the excitation light focusing unit coincides with the focus of the first off-axis parabolic mirror 3, and the test sample 5 is arranged at the focus; at this time, the first off-axis parabolic reflector 3 may collect and collimate the scattered light by using the concave reflecting surface thereof, so that the collimated scattered light is transmitted in parallel to the direction of the main axis of the first off-axis parabolic reflector 3, so that all the scattered light received by the first off-axis parabolic reflector 3 is transmitted along the main axis of the first off-axis parabolic reflector 3, and the light intensity is increased for subsequent analysis.
In the embodiment of the present application, the excitation light focusing unit may be a focusing lens, or may be an off-axis parabolic mirror. Since there is a case that when the deep ultraviolet excitation light is focused by using the focusing lens, the deep ultraviolet laser directly hits on a medium such as an optical fiber or a lens, a serious background material raman signal is generated, and a signal of the test sample 5 is affected, the off-axis parabolic mirror is preferred in this embodiment.
The method specifically comprises the following steps:
the excitation light received by the light inlet of the probe cavity 4 is parallel light, and the excitation light focusing unit comprises a second off-axis parabolic reflector 2; the focus of the second off-axis parabolic reflector 2 coincides with the focus of the first off-axis parabolic reflector 3; the direction of the main shaft of the second off-axis parabolic reflector 2 is parallel to the light path of the exciting light; a second off-axis parabolic mirror 2 for focusing the excitation light onto the test sample 5 with its concave reflecting surface. When the second off-axis parabolic reflector 2 focuses the excitation light, the raman signal of the background material is not generated, and the raman signal of the test sample 5 is not interfered. The test sample 5 in this embodiment is located outside the light outlet of the probe cavity 4, and the size of the light outlet of the probe cavity 4 is determined according to the numerical aperture of the second off-axis parabolic reflector 2.
In order to make the structure of the probe compact, the application defines that the first off-axis parabolic reflector 3 is arranged on the light path of the exciting light emitted by the second off-axis parabolic reflector 2; the first off-axis parabolic reflector 3 is provided with a light through hole 10, and the exciting light emitted by the second off-axis parabolic reflector 2 irradiates the test sample 5 through the light through hole 10. Wherein, the ratio of the area of the light outlet of the light through hole 10 to the projection area of the reflection surface of the first off-axis parabolic reflector 3 in the optical axis direction is less than 5%. The size of the light through hole 10 that sets up on the first off-axis parabolic mirror 3 is injectd to this application to guaranteed that the exciting light can shine on test sample 5 through light through hole 10, can not influence the collection of the scattered light that first off-axis parabolic mirror 3 produced test sample 5 because of light through hole 10 is too big simultaneously again.
In order to filter Rayleigh signals in the scattered signals of the test sample 5, an optical filter 6 is arranged in the probe cavity 4; the filter 6 may be a prior art filter 6, preferably an edge filter 6.
The optical filter 6 in this embodiment is disposed on a light path of the scattered light emitted from the first off-axis parabolic mirror 3, and a plane of a filter surface of the optical filter 6 is perpendicular to a transmission direction of the scattered light, and is used for filtering rayleigh signals in the scattered light.
In order to realize the connection of the probe of the present application and various spectrometers, a rear focusing lens 7, an optical fiber coupler 8 and an optical fiber 9 are further provided. The rear focusing lens 7 and the optical fiber coupler 8 are arranged in the probe cavity 4, and the optical fiber 9 is connected with the probe cavity 4; the rear focusing lens 7 is coaxially arranged with the optical filter 6 and is used for focusing the scattered light emitted by the optical filter 6 on the optical fiber coupler 8; and the optical fiber coupler 8 is used for coupling the received scattered light into an optical fiber 9, and the optical fiber 9 is connected with an external spectrometer. When the probe is used in an ultraviolet band, the rear focusing lens 7 is made of ultraviolet fused quartz.
In order to ensure the collection and collimation of the scattered light at the focus of the first off-axis parabolic reflector 3, the off-axis angle of the first off-axis parabolic reflector 3 is limited to 75-115 degrees, preferably 90 degrees. In order to ensure that the second off-axis parabolic mirror 2 can focus the parallel excitation light on the test sample 5, the off-axis angle of the second off-axis parabolic mirror 2 is limited to 75-115 degrees, preferably 90 degrees.
The wavelength range of the excitation light used by the probe is 177-700 nm, and the probe is particularly suitable for the excitation light of 244-420 nm, and the optimal wavelength is 244-270 nm.
In order to avoid the interference of external stray light, the probe cavity 4 is limited to be made of a non-transparent material, wherein the best material is aluminum, and the best material can be opaque plastic or alloy and the like.
When the wavelength of the excitation light is 244-420 nm, the reflectivity of the first off-axis parabolic reflector 3 and the reflectivity of the second off-axis parabolic reflector 2 are both required to be greater than or equal to 88%. Thereby ensuring the light intensity and quality of the collected scattered light. In order to ensure the reflectivity, ultraviolet aluminum films are arranged on the reflectivity of the first off-axis parabolic reflector 3 and the reflecting surface of the second off-axis parabolic reflector 2. When the probe is used for visible light, the reflectivity of the first off-axis parabolic reflector 3 and the reflecting surface of the second off-axis parabolic reflector 2 can be plated with silver films.
The working process of the probe is as follows:
A. the exciting light horizontally enters a second off-axis parabolic reflector 2;
B. the second off-axis parabolic mirror 2 focuses the horizontally collimated excitation light;
C. the focused excitation light excites the test sample 5, and the Raman signal and the Rayleigh signal scattered by the test sample 5 are collected and collimated by the first off-axis parabolic reflector 3 to obtain a collimated Raman signal and a collimated Rayleigh signal;
D. the collimated Raman signal and the Rayleigh signal are filtered by the edge optical filter 6 to obtain a collimated Raman signal;
E. the collimated raman signal directs the light into the raman spectrometer through the rear focusing lens 7, the fiber coupler 8 and the fiber.
To further illustrate the benefits of the probe of the present application, the raman spectrum of a ptfe sample is detected using the probe and compared to the raman spectrum of a ptfe sample detected by a conventional raman probe. During the verification, the excitation light used had a wavelength of 257 nm. The detection results are shown in fig. 3 and 4.
Fig. 3 and 4 are deep ultraviolet raman spectrograms (257 nm excited polytetrafluoroethylene samples) obtained by using the probe according to the present invention and a conventional focusing lens, respectively, and it can be seen by comparison that the probe according to the present invention overcomes the problems of low light transmittance, serious interference of background signals, and strong quartz raman scattering signals that cannot be eliminated in a deep ultraviolet excitation region.
The utility model discloses a probe is collected to raman signal based on off-axis parabolic mirror, use first off-axis parabolic mirror to collect the scattered light that test sample produced under the excitation of exciting light, because it compares with the lens that occupies the same space, it is big to receive the face, so can gather more scattered light, the light intensity of scattered light has been improved, thereby make the range of application of this probe wider, not only can be used to the collection of the raman light of visible light wave band, also can be used to the collection of the less strong raman light of deep ultraviolet wave band, the problem that traditional optic fibre raman can not be used for the deep ultraviolet wave band has been overcome. Meanwhile, the design of a space free light path is adopted, the loss of light energy is reduced, the integrated design of the probe and various spectrometers is realized, and the probe is particularly suitable for application of a miniaturized, modularized and portable deep ultraviolet band Raman spectrometer.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (13)
1. An off-axis parabolic mirror based raman signal collection probe, comprising: the device comprises a hollow probe cavity, an excitation light focusing unit and a first off-axis parabolic reflector, wherein the excitation light focusing unit and the first off-axis parabolic reflector are arranged in the probe cavity;
the excitation light focusing unit is used for focusing the excitation light received by the light inlet of the probe cavity on the test sample; the test sample emits scattered light under excitation of the excitation light;
the first off-axis parabolic reflector is used for collecting the scattered light by utilizing the concave reflecting surface of the first off-axis parabolic reflector, so that the collected scattered light is transmitted in the direction of the main axis of the first off-axis parabolic reflector.
2. An off-axis parabolic mirror based raman signal collection probe according to claim 1, wherein said excitation light focusing unit coincides with a focal point of said first off-axis parabolic mirror, said test sample being disposed at said focal point;
correspondingly, the first off-axis parabolic reflector is used for collimating the scattered light by using the concave reflecting surface of the first off-axis parabolic reflector, so that the collimated scattered light is transmitted in a direction parallel to the main axis of the first off-axis parabolic reflector.
3. The off-axis parabolic mirror based raman signal collection probe of claim 2, wherein the excitation light received by the light entrance of the probe cavity is parallel light;
the excitation light focusing unit comprises a second off-axis parabolic mirror;
the second off-axis parabolic mirror coincides with the focus of the first off-axis parabolic mirror;
the direction of the main shaft of the second off-axis parabolic reflector is parallel to the light path of the exciting light;
the second off-axis parabolic reflector is used for focusing the exciting light on the test sample by utilizing the concave reflecting surface of the second off-axis parabolic reflector.
4. An off-axis parabolic mirror based raman signal collection probe according to claim 3 wherein said first off-axis parabolic mirror is disposed in the optical path of the excitation light exiting said second off-axis parabolic mirror;
the first off-axis parabolic reflector is provided with a light through hole, and the exciting light emitted by the second off-axis parabolic reflector irradiates the test sample through the light through hole.
5. An off-axis parabolic mirror based raman signal collection probe according to claim 4, wherein a ratio of an area of a light exit of said light passing aperture to a projected area of a reflecting surface of said first off-axis parabolic mirror in an optical axis direction is less than 5%.
6. An off-axis parabolic mirror based raman signal collection probe according to any one of claims 1 to 5 further comprising an optical filter disposed within the probe cavity;
the optical filter is arranged on a light path of the scattered light emitted by the first off-axis parabolic reflector, and a plane where the optical filter surface is located is perpendicular to the transmission direction of the scattered light and is used for filtering Rayleigh signals in the scattered light.
7. The off-axis parabolic mirror based raman signal collection probe of claim 6 further comprising a rear focusing lens and fiber coupler disposed within a probe cavity and an optical fiber connected to the probe cavity;
the rear focusing lens is coaxially arranged with the optical filter and is used for focusing the scattered light emitted by the optical filter on the optical fiber coupler;
the optical fiber coupler is used for coupling the received scattered light into the optical fiber.
8. An off-axis parabolic mirror based raman signal collection probe according to claim 3 wherein said first and second off-axis parabolic mirrors each have an off-axis angle of 75 to 115 degrees.
9. An off-axis parabolic mirror based raman signal collection probe according to claim 3, wherein said excitation light has a wavelength of 177 to 700 nanometers.
10. An off-axis parabolic mirror based raman signal collection probe according to claim 3, wherein the excitation light wavelength is 244 and 420 nanometers.
11. An off-axis parabolic mirror based raman signal collection probe according to claim 3, wherein the wavelength of said excitation light is 244 and 270 nm.
12. The off-axis parabolic mirror based raman signal collection probe of claim 10, wherein a reflectivity of said first off-axis parabolic mirror and a reflectivity of said second off-axis parabolic mirror are each greater than or equal to 88% when a wavelength of said excitation light is 244 and 420 nanometers.
13. An off-axis parabolic mirror based raman signal collection probe according to claim 3 wherein said first and second off-axis parabolic mirrors are each 90 degrees off-axis.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115656141A (en) * | 2022-11-15 | 2023-01-31 | 奥谱天成（厦门）光电有限公司 | Raman spectrum probe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115656141A (en) * | 2022-11-15 | 2023-01-31 | 奥谱天成（厦门）光电有限公司 | Raman spectrum probe |
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